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FAIR VALUE MEASUREMENTS (Estimated Fair Values of the Financial Assets and Liabilities not Measured at Fair Value on a Recurring Basis) (Details) - Nonrecurring - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Level 1 |  |
Financial Assets: |  |
Cash equivalents: |  | $ 407,817
Restricted cash |  | 1,136
Employee loans |  | 0
Level 1 | Revolving credit facility | Credit Facility 2017 |  |
Financial Liabilities: |  |
Borrowings |  | 0
Level 2 |  |
Financial Assets: |  |
Cash equivalents: |  | 10,002
Restricted cash |  | 0
Employee loans |  | 0
Level 2 | Revolving credit facility | Credit Facility 2017 |  |
Financial Liabilities: |  |
Borrowings |  | 25,017
Level 3 |  |
Financial Assets: |  |
Cash equivalents: |  | 0
Restricted cash |  | 0
Employee loans |  | 2,434
Level 3 | Revolving credit facility | Credit Facility 2017 |  |
Financial Liabilities: |  |
Borrowings |  | 0
Balance |  |
Financial Assets: |  |
Cash equivalents: | $ 171,903 | 417,819
Restricted cash | 1,158 | 1,136
Employee loans | 1,168 | 2,434
Balance | Revolving credit facility | Credit Facility 2017 |  |
Financial Liabilities: |  |
Borrowings | 25,006 | 25,017
Estimated Fair Value |  |
Financial Assets: |  |
Cash equivalents: | 171,903 | 417,819
Restricted cash | 1,158 | 1,136
Employee loans | 1,168 | 2,434
Estimated Fair Value | Revolving credit facility | Credit Facility 2017 |  |
Financial Liabilities: |  |
Borrowings | 25,006 | 25,017
Estimated Fair Value | Level 1 |  |
Financial Assets: |  |
Cash equivalents: | 171,903 |
Restricted cash | 1,158 | 1,136
Employee loans | 0 | 0
Estimated Fair Value | Level 1 | Revolving credit facility | Credit Facility 2017 |  |
Financial Liabilities: |  |
Borrowings | 0 | 0
Estimated Fair Value | Level 2 |  |
Financial Assets: |  |
Cash equivalents: | 0 |
Restricted cash | 0 | 0
Employee loans | 0 | 0
Estimated Fair Value | Level 2 | Revolving credit facility | Credit Facility 2017 |  |
Financial Liabilities: |  |
Borrowings | 25,006 | 25,017
Estimated Fair Value | Level 3 |  |
Financial Assets: |  |
Cash equivalents: | 0 |
Restricted cash | 0 | 0
Employee loans | 1,168 | 2,434
Estimated Fair Value | Level 3 | Revolving credit facility | Credit Facility 2017 |  |
Financial Liabilities: |  |
Borrowings | 0 | 0
Money market funds | Level 1 |  |
Financial Assets: |  |
Cash equivalents: |  | 407,817
Money market funds | Level 2 |  |
Financial Assets: |  |
Cash equivalents: |  | 0
Money market funds | Level 3 |  |
Financial Assets: |  |
Cash equivalents: |  | 0
Money market funds | Balance |  |
Financial Assets: |  |
Cash equivalents: | 171,903 | 407,817
Money market funds | Estimated Fair Value |  |
Financial Assets: |  |
Cash equivalents: | 171,903 | 407,817
Money market funds | Estimated Fair Value | Level 1 |  |
Financial Assets: |  |
Cash equivalents: | 171,903 | 407,817
Money market funds | Estimated Fair Value | Level 2 |  |
Financial Assets: |  |
Cash equivalents: | 0 | 0
Money market funds | Estimated Fair Value | Level 3 |  |
Financial Assets: |  |
Cash equivalents: | 0 | 0
Time deposits | Level 1 |  |
Financial Assets: |  |
Cash equivalents: |  | 0
Time deposits | Level 2 |  |
Financial Assets: |  |
Cash equivalents: |  | 10,002
Time deposits | Level 3 |  |
Financial Assets: |  |
Cash equivalents: |  | 0
Time deposits | Balance |  |
Financial Assets: |  |
Cash equivalents: |  | 10,002
Short-term investments | 60,089 |
Time deposits | Estimated Fair Value |  |
Financial Assets: |  |
Cash equivalents: |  | 10,002
Short-term investments | 60,089 |
Time deposits | Estimated Fair Value | Level 1 |  |
Financial Assets: |  |
Cash equivalents: |  | 0
Short-term investments | 0 |
Time deposits | Estimated Fair Value | Level 2 |  |
Financial Assets: |  |
Cash equivalents: |  | 10,002
Short-term investments | 60,089 |
Time deposits | Estimated Fair Value | Level 3 |  |
Financial Assets: |  |
Cash equivalents: |  | $ 0
Short-term investments | $ 0 |

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